Solar cells for terrestrial concentration systems
Photovoltaic energy source is a must in the green sector. The terrestrial application of high efficiency multi-junction solar cells is within High Concentration PhotoVoltaic systems (HCPV)*.
HCPV concentrates the sunlight through lenses or mirrors thus increasing the electricity generated while the costly cell surface is reduced.
CESI developed triple junction solar cells InGaP//Ge whose efficiency is in the range of 40% (AM1,5D) when the incident light is concentrated with a factor higher than 500.
HCPV brings its best benefit in High Direct Normal Irradiation (DNI) areas where HCPV is an attractive alternative to traditional solar because a lower levelized cost of energy (LCOE) can be achieved by the conjoint effect of decreasing the manufacturing costs and improving the efficiency performance through technology innovation.
* "Concentrated photovoltaic (CPV) technology uses optics such as lenses or curved mirrors to concentrate a large amount of sunlight onto a small area of solar photovoltaic (PV) cells to generate electricity. Compared to regular, non-concentrated photovoltaic systems, CPV systems can save money on the cost of the solar cells, since a smaller area of photovoltaic material is required. Because a smaller PV area is required, CPVs can use the more expensive high-efficiency tandem solar cells. To get the sunlight focused on the small PV area, CPV systems require spending extra money on concentrating optics (lenses or mirrors) and sometimes solar trackers, and cooling systems. Because of these extra costs, CPV is far less common today than non-concentrated photovoltaics. However, ongoing research and development is trying to improve CPV technology and lower costs." (Source: Wikipedia)
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